Safety helmet



FIG. 1 is a front-side perspective view of a safety helmet showing my new design;

FIG. 2 is a rear side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

I claim the ornamental design for a safety helmet, as shown and described. 